Abstract
In recent years, with the rise of interest in environmental problems, noise reduction in motors has become a strigent requirement There are three kinds of motor acoustic noise: ventilation noise, electromagnetic noise and machine noise. It is assumed that ventilation noise in high speed machines consists mostly of fan noise. Fan noise, depends on the number of rotations and the number of fan blades and by the turbulence sound produced by the disturbed flow of cooling air. Many studies have been done on reduction of fan blade and turbulence noise by flow analysis based on fan blade number and shape. However, there have been no papers describing the space resonance frequency of the fan space, which is a propagation channel of the fan noise. Thus, in this paper, the space resonance frequency and resonance mode of the fan channel analyzed by Helmholts theory and experiments. The effect of rotational sound and resonance mode on noise is also described.
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